What is data, database and DBMS?

Data 

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Data is a collection of raw facts and figure which is isolated, unrelated and unorganized, but able to organize into useful information. Data can be manipulated to produce output. Data are the raw facts from which we start to get information. Example: 1, Ram, Table etc. 

Database 

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A database is a collection of related information about a subject organized in a useful manner that provides a base or foundation for procedure, such as retrieving information, drawing conclusion and make decision. 
A database is a collection of data of certain place or person or things in such a way that it can be easily access by an application program like DBMS. A database represents some aspect of the real world. Some examples of database are database of student, database of employee etc. all are related to the real world. It is a collection of related data, which has some meaning. 

DBMS (Database Management System)

A DBMS is a set of programs that manages the database files. The DBMS allows to access the files update the records, and retrieve data as requested. The DBMS acts as an interface between the application program and the data in the database. For example: Microsoft Access, Oracle, MySQL etc.

The question related to DBMS:

Advantages of Database Management System (DBMS)
Disadvantages of Database Management System (DBMS)